diff --git a/contracts/metrics/quality-facts.schema.json b/contracts/metrics/quality-facts.schema.json
index ff63bcf..c29cece 100644
--- a/contracts/metrics/quality-facts.schema.json
+++ b/contracts/metrics/quality-facts.schema.json
@@ -52,7 +52,7 @@
               "string_value": { "type": ["string", "null"] },
               "source_text": { "type": ["string", "null"] },
               "confidence": { "type": ["number", "null"] },
-              "is_recognized": { "type": "boolean" },
+              "is_recognized": { "type": ["boolean", "null"] },
               "needs_review": { "type": "boolean" }
             }
           }